Domestic Door Locks

5 Lever BS3621 Mortice Lock

This type of deadlock or sashlock would be fitted to external doors and are generally the minimum level of security specified by an insurance company.

Having 5 levers, these locks offer around 1000 differs (possible keys), anti-drill and pick protection and anti-sawprotection in the deadbolt.

The latest British Standard for this type of lock is BS3621 2007.

2/3 Lever Mortice Lock

This type of deadlock or sashlock would be fitted to internal doors as they are a lower level of security and sometimes have a number stamped on the key to simplify key duplication.

Cylinder Mortice Lock

This type of deadlock and sashlock give a wider scope of options. You can choose a cylinder lock case to suit your needs and then add the cylinder type you require. Whether that be a cylinder with a thumb turn for safety, or a security cylinder with restrictions for duplicating keys.

Mortice Nightlatch

This type of latch is fitted inside the door and is used in conjunction with a euro profile cylinder or an oval profile cylinder.

This type of latch is commonly fitted into a communal door of a block of flats.

All types of wooden door locks can be supplied in in a range of sizes and finishes to suit your individual needs, from all of the leading brands:

Rim Nightlatch

Rim nightlatches (non double locking) - These are sometimes referred to as ‘Yale’ locks. Most people with a timber door will have one located about a third of the way down the door on the inner surface and you’ll use it to open and shut the door.

Double Locking Nightlatches

Double locking nightlatches – When double locked with the key the latch cannot be slipped. Some of them also allow you to lock the knob on the inside with the same key (instead of the snib) and this will prevent the knob being turned by sticks, cables and so on through the letter plate.

Insurance Nightlatches - BS3621:2007

Insurance nightlatches – BS 3621:2007. Locks like this will be marked by the British Standard Kitemark. This is the latest version of BS 3621, but it is likely that insurers will still accept locks certificated to the previous version, BS 3621:2004 or earlier versions, but check with your insurer. These higher quality rim nightlatches will sometimes have a flat ended latching bolt which is thrown into the keep as the door closes. They also have armoured external parts to prevent drill/saw attack. These locks are not suitable for communal doors because of means of escape issues.

If you would like to upgrade or replace the locks on your commercial or domestic property, please contact us at Errington Locksmiths in Milton Keynes.